站点A与站点B采用HDLC进行通信，数据传输过程如下图所示。建立连接的SABME帧是（ ）。在接收到站点B发来的“REJ，1”帧后，站点A后续应发送的3个帧是（ ）帧。
问题1选项
A.数据帧
B.监控帧
C.无编号帧
D.混合帧
问题2选项
A.1，3，4
B.3，4，5
C.2，3，4
D.1，2，3
正确答案及解析
正确答案
解析
答案： C、D
当建立LAPD连接时，SABME帧一般是第一个被传递的帧，属于无编号帧。接收方发送 REJ（i），当发送方接受到该REJ时，发送方重传第i帧以及第i帧后续的所有帧。
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